To increase the overall unit sizes you can simply edit the preferences.script with notepad.
To find the file on vista/Windows 7, go to:
C:\Users\*yourname*\AppData\Roaming\The Creative Assembly\Napoleon\scripts
Find the bit saying 'campaign_unit_multiplier 1;' and change the number. Obviously the number acts as a multiplier for the number of units. Eg, 1 would give 120 men, 2 would give 240 etc
Keep in mind the bigger the multiplier, the more powerful system you will need to handle so many units.
There are a few interesting bits and pieces in the file which can be changed, though mainly gfx related. Remember to back up before changing.
More complex tweaks will have to be done via editors which is explained in other threads on here.
edit***Seems to work in battles as well as campaign, to.
[Edited by Darkestedge, 6/23/2010 11:16:33 AM]
good post thanks for the info +1
No problem. Just another quick note. If you at some point need to change your gfx settings or a major update is released for NTW, there is a possibility that the multiplier tweak might revert to 1 again. Simply turn it back. Once you are sure that all settings are correct and don't need changing in the future, set the file to read only. This *should* stop any changes being made permanent to the file.
Thanks for the inform.